DOI: 10.1073/pnas.1916401117
论文题名: Fast oxidation of sulfur dioxide by hydrogen peroxide in deliquesced aerosol particles
作者: Liu T. ; Clegg S.L. ; Abbatt J.P.D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 3 起始页码: 1354
结束页码: 1359
语种: 英语
英文关键词: Aerosol kinetics
; air pollution
; Chinese haze
; Multiphase chemistry
; Sulfate aerosol
Scopus关键词: hydrogen peroxide
; sulfate
; sulfur dioxide
; air quality
; aqueous solution
; Article
; flow kinetics
; haze
; humidity
; oxidation
; particulate matter
; pH
; priority journal
; solute
英文摘要: Atmospheric sulfate aerosols have important impacts on air quality, climate, and human and ecosystem health. However, current airquality models generally underestimate the rate of conversion of sulfur dioxide (SO2) to sulfate during severe haze pollution events, indicating that our understanding of sulfate formation chemistry is incomplete. This may arise because the air-quality models rely upon kinetics studies of SO2 oxidation conducted in dilute aqueous solutions, and not at the high solute strengths of atmospheric aerosol particles. Here, we utilize an aerosol flow reactor to perform direct investigation on the kinetics of aqueous oxidation of dissolved SO2 by hydrogen peroxide (H2O2) using pH-buffered, submicrometer, deliquesced aerosol particles at relative humidity of 73 to 90%. We find that the high solute strength of the aerosol particles significantly enhances the sulfate formation rate for the H2O2 oxidation pathway compared to the dilute solution. By taking these effects into account, our results indicate that the oxidation of SO2 by H2O2 in the liquid water present in atmospheric aerosol particles can contribute to the missing sulfate source during severe haze episodes. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164359
Appears in Collections: 气候变化与战略
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作者单位: Liu, T., Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada; Clegg, S.L., School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Abbatt, J.P.D., Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
Recommended Citation:
Liu T.,Clegg S.L.,Abbatt J.P.D.. Fast oxidation of sulfur dioxide by hydrogen peroxide in deliquesced aerosol particles[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(3)